Easily understanding. Persuasion would only help to serve yourself and your ego, which would ultimately prove to be a hollow victory after you've persuaded the world into you ruling it or whatever. Understanding brings peace/acceptance. This question is really more just like a test because those who already have understanding are going to understand why understanding is the right answer.

Understanding is fine, but I believe this to mean that I could understand all things. That doesn't mean I could get OTHERS to understand as well. Others not understanding leads to abominations like 8 years of W. Persuasion is the way to go my friends, persuade those around you to do what's right (oh, and get Jessica Biel to marry me!).